辉绿岩床侵入对围岩有机质热演化影响的模拟研究——以赵家山下马岭组剖面为例

doi:10.13809/j.cnki.cn32-1825/te.2022.01.022

Abstract

Abstract:

The black shales is widely distributed in Proterozoic Xiamaling Formation of Yanshan area, making the Xiamaling Formation to be an important potential target for shale gas exploration. Field profile survey shows that several sets of diabase sill intruded into Xiamaling Formation, which has great influence on oil and gas accumulation. Therefore, the numerical simulation study on the influence of a set of diabase bed about 7 m thick on the maturity of host rock is carried out based on the measurement of the field section and bitumen reflectance of the neighbouring shales. The results show that the influence range of this diabase bed on R_o of organic matter in host rock is about 8.5 m, which is about 1.2 times of its own thickness. The measured R_o values increases exponentially near the bedrock. The numerical simulation results show that the diabase will cool down almost completely after 110 years, and the disturbance range to the surrounding rock geothermal field is about 100 m, which is much larger than the influence range of R_o. Only when the surrounding rock temperature is greater than or equal to 250 ℃ can it cause the change response of the R_o values. The greater the thickness of diabase bed, the greater the influence range on R_o of organic matter in host rock, and the greater the increase of R_o near the bedrock. The influence range of diabase bed on R_o of organic matter in host rock is about the same to its own thickness.

Key words: Xiamaling Formation, outcrop section, diabase sill, black shale, thermal maturity of organic matter

CLC Number:

TE121

LIU Junlan,ZHANG Jinchuan,WANG Sheng,CHEN Li,NIU Jialiang. Numerical simulation of influence of diabase bed intrusion on thermal evolution of organic rich host rock: A case study of Zhaojiashan Xiamaling Formation[J].Reservoir Evaluation and Development, 2022, 12(1): 255-264.

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参数赋值	辉绿岩参数			围岩参数
参数赋值	密度（kg/m³）	比热容（J/kg•K）	热导率[W/（m·K）]	密度（kg/m³）	比热容（J/kg•K）	热导率[W/（m·K）]
本文参数赋值	2 600	850	2.10	2 400	820	1.60
文献参数取值	2 600^{[19, 22]} 2 720^[20] 2 700^[23]	787^[24] 820^{[19, 22]} 1 090^[20] 1 200^[23]	2.10^{[19, 22, 23]} 2.50^[20] 2.64^[25]	2 600^[19] 2 700^{[20, 23]} 2 400^[22]	820^{[19, 23]} 850^[22] 1 090^[20]	1.30^[23] 1.72^[24] 2.10^{[20, 22, 25]}

Numerical simulation of influence of diabase bed intrusion on thermal evolution of organic rich host rock: A case study of Zhaojiashan Xiamaling Formation

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